CA1237174A - Filtre d'ondes sonores superficielles - Google Patents

Filtre d'ondes sonores superficielles

Info

Publication number
CA1237174A
CA1237174A CA000487843A CA487843A CA1237174A CA 1237174 A CA1237174 A CA 1237174A CA 000487843 A CA000487843 A CA 000487843A CA 487843 A CA487843 A CA 487843A CA 1237174 A CA1237174 A CA 1237174A
Authority
CA
Canada
Prior art keywords
electrodes
acoustic wave
surface acoustic
wave filter
apodization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000487843A
Other languages
English (en)
Inventor
Thrygve R. Meeker
Wei-Shin Tsay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Application granted granted Critical
Publication of CA1237174A publication Critical patent/CA1237174A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14517—Means for weighting
    • H03H9/1452—Means for weighting by finger overlap length, apodisation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02614—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves
    • H03H9/02629—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves of the edges
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14502—Surface acoustic wave [SAW] transducers for a particular purpose
    • H03H9/14505—Unidirectional SAW transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6489—Compensation of undesirable effects
    • H03H9/6496—Reducing ripple in transfer characteristic
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02637—Details concerning reflective or coupling arrays
    • H03H9/02653—Grooves or arrays buried in the substrate
    • H03H9/02661—Grooves or arrays buried in the substrate being located inside the interdigital transducers

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
CA000487843A 1984-08-01 1985-07-31 Filtre d'ondes sonores superficielles Expired CA1237174A (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/636,679 US4577169A (en) 1984-08-01 1984-08-01 Small ripple surface acoustic wave filter with low insertion loss
US636,679 1984-08-01

Publications (1)

Publication Number Publication Date
CA1237174A true CA1237174A (fr) 1988-05-24

Family

ID=24552897

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000487843A Expired CA1237174A (fr) 1984-08-01 1985-07-31 Filtre d'ondes sonores superficielles

Country Status (6)

Country Link
US (1) US4577169A (fr)
EP (1) EP0188604B1 (fr)
JP (1) JP2628985B2 (fr)
CA (1) CA1237174A (fr)
DE (1) DE3576258D1 (fr)
WO (1) WO1986001054A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638047B1 (fr) * 1988-10-14 1990-11-23 Thomson Csf
US5313177A (en) * 1992-04-06 1994-05-17 Motorola, Inc. Method and apparatus for an acoustic wave filter
US5349359A (en) * 1993-05-10 1994-09-20 Environmental Research Institute Of Michigan Spatially variant apodization
US5528206A (en) * 1994-11-23 1996-06-18 Murata Manufacturing Co., Ltd. Surface acoustic wave filter with attenuated spurious emissions
JP3185591B2 (ja) * 1995-03-03 2001-07-11 株式会社村田製作所 Ｓａｗ共振子
AU2001253017A1 (en) * 2000-03-30 2001-10-15 Sawtek, Inc. Die layout for saw devices and associated methods

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675054A (en) * 1970-12-02 1972-07-04 Texas Instruments Inc Series connection of interdigitated surface wave transducers
FR2146541A5 (fr) * 1971-07-16 1973-03-02 Thomson Csf
FR2290786A1 (fr) * 1974-11-08 1976-06-04 Thomson Csf Dispositif a reflexion selective d'ondes elastiques de surface
US4006438A (en) * 1975-08-18 1977-02-01 Amp Incorporated Electro-acoustic surface-wave filter device
GB1565756A (en) * 1976-09-30 1980-04-23 Toko Inc Surface elastic wave devices
US4130813A (en) * 1977-05-23 1978-12-19 Raytheon Company Surface wave device having enhanced reflectivity gratings
CA1118883A (fr) * 1977-06-02 1982-02-23 Thomas E. Parker Methode de fabrication de transducteurs d'ondes acoustiques de surface pour reduire les reflexions
JPS5847090B2 (ja) * 1977-08-10 1983-10-20 株式会社村田製作所 弾性表面波フイルタ
US4237433A (en) * 1979-03-13 1980-12-02 Sperry Corporation Surface acoustic wave resonators with integrated internal coupler reflectors
JPS564916A (en) * 1979-06-25 1981-01-19 Murata Mfg Co Ltd Elastic surface wave filter
JPS5715514A (en) * 1980-07-01 1982-01-26 Nec Corp Manufacture for reed screen electrode for elastic surface wave
US4353046A (en) * 1980-11-04 1982-10-05 R F Monolithics, Inc. Surface acoustic wave device with reflectors
JPS57103420A (en) * 1980-12-18 1982-06-28 Toko Inc Grouped unidirectional surface acoustic wave transducer
DE3117747A1 (de) * 1981-05-05 1982-11-25 Kollsman System-Technik GmbH, 8000 München Piezoelektrisches element
US4499440A (en) * 1983-08-22 1985-02-12 United Technologies Corporation Low reflectivity electrodes in semiconductive SAW devices

Also Published As

Publication number Publication date
WO1986001054A1 (fr) 1986-02-13
JPS61502930A (ja) 1986-12-11
JP2628985B2 (ja) 1997-07-09
US4577169A (en) 1986-03-18
EP0188604A1 (fr) 1986-07-30
EP0188604B1 (fr) 1990-02-28
DE3576258D1 (de) 1990-04-05

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Legal Events

Date Code Title Description
MKEX Expiry